Reinforced-grid resistance.



H. J. WIEGAND.

REINFORCED GRID RESISTANCE. APPLICATION FILED MAY 25, 1911. RENEWED-FEB. s, 1913.

1,071,844, Patented Septr2, 1913.

UNITED STATES PATENT OFFICE.

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Specification of Letters Patent.

- PatentedSept.2,1913.

Application filed Kay'25, 1911, Serial No. 629,497. Renewed February 3, 1913. Serial No. 746,042.

' To all whom it may concern:

Be it known that. I, HENRY J. WVIEGAND, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsim'have invented new and usefu1- Improvements .in Reinforced-Grid Resistances, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, form1ng a part of this specification.

My'invention relates to improvements in reinforced grid resistances.

Among the objects of my invention is to provide improved means for attaching a reinforcing strip to a resistance grid.

Other objects and advantages of my invention will hereinafter appear.

\Inthe accom anying drawings I have. illustrated one. -orm which my invention may assume in practice. My invention, however is not limited to the-form therein shown. p

In the views'of the drawings :-Figure 1 shows a side elevationof a reinforced grid. Fig. 2 shows a sectional view on line 2-2, Fig. 1. Fig. 3 shows a sectional view on line '33, Fig. 1. Fig. 4: shows a detail view of one form of means used to hold the reinforcing strip to the grid. I

In these drawings I have illustrated a resistance grid'l of the reflexed type having terminals 2 and reflexed ends 3. These reflexed ends are inclosed in an insulating strip 4, as illustrated in Fig.2. The strip 4 is inclosed'in a reinforcing strip 5 having strengthening ribs 6 andconstructed as de-- scribed and claimed in my previously granted Patent No. 982,557 patented J any 24, 1911. In order to provide an improved means for holding the insulating strips and the reinforcing strips in position upon the refiexed ends of the grid as shown in Fig. 1, I preferablyemploy a suitable rivet or fastener 7 which is passed through openings or slits in the insulating and reinforcing strips as shown in Fig. 2. In a preferred form this fastener is of the T shape illustrated in Fig; 4 and is passed between the arms 13f a convolution of the grid as shown in Fig. 1 so that its shank is adjacent the inner surface of the curved end of the convolution. After it has been passed through the reinforcing stri and the insulating strip its head is pre erab'ly pressed into the reinforcing strlp to indent the same and the insulating str1p,.

as shown in Fig. 2 so that the head of the 'the grid.

but wish to cover fastener lies substantially flush with the sure;

face of the reinforcing strip. The bifurcatede'nds of the rivet are alsopreferably spread in opposite directions after passing through the strips and are pressed into the surface ofthe reinforcing strip in the same manner so as to lie substantially flush with the same. Thus itis seen that the strips are securely and snugly held in position on- It is of course to be understood that in applying my invention to practice I may use various other forms of rivets or fasteners, and that the same may be suitably insulated from the grid when passed between the same.

It is to be noted that the rivet or fastener is passed between the arms .of one of the convo utions ,of the grid near its end. In a preferred form the shank of the rivet may be spaced apart from the grid in order to pr0- vlde air insulation for the same.

sired, however, the fastener maybe in elecpreferred form. the upper and lower fast-ening means illustrated in Fig. 1 are offset as "shown so that the fasteningdevices are passed between the ends of successive con-' volutions. upon the ends of the grid are firmly and se cu'rely held in place and that the completed grid provided with the strips upon both of its ends 15 very compact and unitary in. construction.

Thus it is seen that the strips 5 a While I have in this application described one form which my invention may assume in practice, I do not wish to be limited to the specific construction herein illustrated,

which my invention may be incorporated which fall within the scope of the appended claims.

What I claim as new and desire tosecure Letters Patent is as follows 1'1. The. combination with a convoluted resistance unit, of a reinforcing member for the ends of the convolutions thereof provided with means extending through the closed end of a convolution of said unit and secured on the oppositeside of said unit to positively'ret-ain said reinforcing member on 2. The combination with a resistance grid, of a U shaped reinforcing stri fitting over an edge thereof and means or clamping said strip upon said grid, saidmeans having 'all modified forms in 5 I a portion extending through the closed end J clamp said strip upon said grid and to of one of the eonvolutions of said grid to positlvely secure the same together. MN positively insureretention of said strip upon In Witness whereof, I have hereunto sub- Sfiid g scribed my name in the presence of two Wit- 5 3. The combination with a resistance grid, nesses.

an edge thereof and a device extending through opposite sides of said reinforcing Witnesses:

striR and through the closed end of one ofv R. GRAY JoNEs, 10 the convolutions of said grid to tightly W. M. HELZ.

of a U shaped reinforcing strip fitting over v HENRY VVIEGAND' Copies of this patent may be obtained for five cent; each, by addressing the Commissioner of ,Batents,

' Washington, D. 0. Y 1 

